Improved three-horse equalizer



E. M. WRlGHT.

Draft Equalizer.

Patented July 13, 1869.

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ELIAS M. WRIGHT, OF CASTILE, NEW YORK, ASSIGNOR FOR ONE- HALF TO GARDNER HERRICK, ALBION, MICHIGAN.

Letters Patent No. 92,503, dated July 13, 1869.

IMPROVED THREE-HORSE .E UALIZE' The Schedule referred to in these Letters Patent and making part of the same.

To all whom it may concern.-

two horses of the team are connected with the shortarm of a bar, or equivalent vibrating-device coupled to the plow-beam, and the single horse is hitched to the opposite arm or side of such device, at such point as will enable the single horse to exert as much power to keep himself abreast in the line as is exerted conjoint-ly by the two.

The equalizing-devices hitherto used in this kind of arrangement consist mainly of the straight vibratingbar, to the ends of. which the draught-chains are hitched, and of whole or'half pulleys of proper relative diameter or radius, around the peripheries of which the draught-chains partially wind or unwind, as the horses fall back or advance out of a true breast line.

The long and short-arm bar is capable ofbcing connccted close up to the plow, but has its equalizing capacity seriously deranged, when vibrated beyond a too circumscribed arc; and the concentric pulleys or half pulleys, although furnishing a perfect equalization of draught, have the fulcrum-centre too faraway from the plow, and, being necessarily heavy, add detrimentally to the'hamper of the hitching-gear.

The object of iny invention is to remedy the aforesaid defects, and for the purpose of enabling others skilled in this branch to construct my invention, I will proceed to describe the same.

My improved equalizing-device is represented at A. It is simply a cam-shaped cast bar, havinga straight front edge, and curved back edge and corners, and is pivoted in a clevis, O, which is linked by another clevis (not shown) to the beam of the plow, or other object to be moved.

D isthe draught-chain, which is hitched to the single middle horse of the team, and D connects with the double-tree of the two outer horses.

The bearings of these chains are on the curves indicated by the dotted red lines 2', all beyond that being simply flanges, forming grooves, which, with the aid of the arched guards or loops, 7), confine the chains loosely .in place, and I generally hitch the chains to the equalizer, by passing the end links over curved studs, s,'which, as well as the-guards, are cast on.

My equalizi-ug-curves, i, are not concentric, but are curves of such radial proportions, struck from such determinate points, that during the vibration of the equalizer, the chain D, or rather its bearing on the curve, will always-be twice the distance from the fulcrum-point 1;, than is the bearing of the chain D, on its curve, when measured in a line forming a right angle with the lines of draught, as may be clearly seen in the-drawing, where a; is the fulcrum-line and m and n the respective lines of draught, at or about extreme points of vibration. i i

The space at o is merely to lighten the casting, and the hollow back of the fulcrum is for the samelpurpose.

The advantage of my invention over others for this purpose is, that while it causes as perfect an equalization of the draught in ateam of three horses, and with as large -a practical range, as the pulley of concentric half-circles, it is as light, and nearly as compact as the simple bar, and capable of nearly as close a connection with the plow.

\Vhat I claim as my invention, and desire to secure by Letterslatent, is the following:

I claim the pivoted cam-bar A, having equalizingcurves, i, in combination with the connecting-clevis O, and draught-chains D and D, when constructed, arranged, and used in connection with a three-horse team, and with a plow or other object to be drawn, substantially as and for the purpose set forth.

ELIAS -M. \VRIGHT.

Witnesses:

WM. HAnmNeToX, N. G. How). 

